Three-time All-American. Heisman Trophy winner. College Football Hall of Famer. Three national titles in three unbeaten seasons. And despite a legendary career running the football for Army, a photographer still asked Glenn Davis to pose like this: Pictures can be deceiving — Davis’ damage came on the ground, with an eye-popping 8.3 yards per carry over his career — an NCAA record. He was “Mr. Outside” to Felix “Doc” Blanchard’s “Mr. Inside,” giving Army a 1-2 Heisman-winning punch in the backfield that dominated college football. Davis ranks third all-time in rushing yards at West Point behind Mike Mayweather and Carlton…